If the 8600gts is faster than the 1900gt, what does it compare to then..I'm guessing somewhere around where the 7900gt is? I've looked for reviews but what I found was inaccurate, in some reviews the 8600 beats the 1900, vice versa
you should think about going with the X1950XT instead of the 8600gts since they're priced the similar.
Newegg.com - SAPPHIRE 100186L Radeon X1950XT 256MB 256-bit GDDR3 PCI Express x16 VIVO HDCP Video Card - Retail
AnandTech has a review comparing the 8600gt/gts cards to a handful of other cards, one being the X1900XT (X1950XT being the higher-end version), which outperforms both the 8600's.
AnandTech: 8600 GT/GTS Follow-up Performance